/Engine/Plugins/Online/OnlineFramework/Source/Lobby/Public/LobbyBeaconClient.h
Make a request to set the party owner for the given player
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(Server, Reliable, WithValidation) virtual void ServerSetPartyOwner ( const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & InUniqueId, const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & InPartyOwnerId )